Locomotive-boiler construction



March 29 1927.

- H. s. JARNAGIN LOCOMOTIVE BOILER CONSTRUCTION Filed Nov. 26, 1924 tfa/vzqyz'la Patented Mar. 29, 1927.

UNITED PATENT HARRY $.JARNAGIN, or RICHMOND HEIGHTS, MISSOURI, AssI'GNoR or ONE-HALF To ROBERT W; BIDWELL, or RICHMOND HEIGHTS, MISSOURI.

Looo'Mo'rIvE-BoILER cousins-omen.

AbpliltiodfildNovember as," 1924; swarm. 752,445;

My invention relates to locomotive boilers, and;-it is a distinct and p'ractica'l improvemerit to overcome certain practical objections to, and defects in,- boiler construction of the prescnt'types for locomotives.

I The objects of my present invention are to provide a' boiler structure with baffle means at opposite ends of the boilertubes toprev'ent the live gases, heat and smoke from passingdirectly through all the tubes in one direction only, but diverting the same to travel back again at ahigher elevation and then finally fo'r w'ard'to 'tl'iestac'k, there by lowering the stack temperature toaminimum and distributing the-heat along its path of travel where it} is most useful:

A further object of the invention is to provide rear and=front baffles, soarranged with relation to the tubes as to have a larger number of" tubes for? the smoke and live gases to first p'assforwardly through; then a less number of tubes to carry the same rearwardly at a higher elevation and finally a less number of tubes to carry the gas and smoke forwardly at a still higher elevation for final escape through the smoke stack, this arrangement of means being provided for the reason that the gases shrink in volume as they pass through the tubes in leaving the combustion chamber of the fire box.

A still further object of the invention is to provide a jet blower in advance of the tubes through which the gases and smoke finally pass to the stack so as to eliminate slow fires.

Vith the above and other objects in View, as will be apparent hereinafter, the invention consists in the novel features of construct-ion, arrangement and combination of parts hereinafter more fully described and finally pointed out in the claims hereto appended.

Referring to the accompanying drawing forming a part of this specification,

The figure is a sectional elevation of a locomotive boiler structure and embodying the features of my invention.

Referring to the drawing, the reference character A represents a locomotive boiler which is provided intermediate its ends with the boiler tubes 1 to provide the fire box combustion chamber 2 and the front boiler chamber 3. The numeral 4 represents a water chamber partly surrounding the fire box combustion chamber 2 and which communic'a'te's with the water spaces 5' above and between the boiler tubes '1;

Disposed withinthe firebox combustion 1 clia1nber2, at the upper" I'rontcornersthere of, is hollow baffle wall B'consisting of two suitable baffle plates 6, spaced apart to" provide a-water space 7a- The baffle plates 6 are'" suitably conne'cted at' their upper ends to the'crown sheet 8'and attheir-lower ends to the rear end plate, or head 9 oftheb'ojiler tubes: The h'ollow baffle wall B is prefen ably angular in shape in side elevation, as

show'nin the drawing, and it providesthe rear smoke passage 10 between the rear head" 9of "tl1e'boiler tubes andthe fire b'o-Xicom' bustion chamber 2, and passage llbetween the lower section of the baffle wall 6 and the lower side of 'the boiler The lower end of the" baffle wall 6 iscon ne'cted with'the boiler tube end wall 9'so that there are" a less number of tubes between the lower end of the bafiie wall and the bottom of the boiler than above the lower edge of the baffle wall and the upper side of the boiler, as shown.

Disposed within the front boiler chamber 3 is a suitable baflle plate, or wall 12 which is. disposed at an inclined position. The upper edge of the bafiie plate, or wall 12 is suitably connected to the front head 13 of the boiler tubes 1 and its lower edge is suitably connected to the lower side of the boiler A, as shown, so as to provide the front smoke passage 14. This arrangement of rear and front bafiie walls provides three smoke and live gas tube passes, or passages, designated 15, 16 and 17. passage 15 is greater than the middle tube passage 16 and the upper tube passage 17 is smaller in area than the middle tube passage 16 so as to compensate for the shrinkage of gases in their path of travel from the combustion chamber 2 to the front boiler chamber 3, from where they escape to the atmosphere through the usual smoke stack 18. It is thus seen that the bafile walls provide an S-chaped path through the boiler tubes for the smoke and gases to follow in passing' rearwardly by the front bafile wall 11 so as The area of the lower tube V to pass through the tubes involved in the pass 16 and then the gases are turned again by the rear baffle wall B and directed to move forwardly through the tubes involved in the smallest and upper pass 17 from where they escape through the smoke stack 18.

The reference numeral 19 represents a steam pipe which is directed from the steam dome 20 to a point in advance of the upper gas pass 17 and it is provided with a suitable jet to spray a stream of steam forwardly to create a suction toward the smoke stack 18 to eliminate slow fires.

From the foregoing description, it is evident that I provide a boiler construction which is highly efiicient for the purpose designed.

The many advantages of the herein de scribed invention will readily suggest themselves to those skilled in the art to which it appertains.

I do not wish to be understood as having limited myself to the exact details of con struction shown and described, but desire to have it understood that the invention I have shown in the-drawings is merely illustrative, as it is manifest that various minor changes may be made in the exact construction and particular arrangement of parts without departing from the spirit of my invention, hence I reserve the right to make any such changes or modifications as may fairly fall within the scope of the appended claims when fairly construed.

hat I claim is:

1. In a locomotive boiler construction, a fire box bounded by a water chamber, boiler tubes in advance thereof and a front compartment for the boiler, a pair of angular spaced bafl'le plates fixed at their forward ends to the rear tube sheet and at their upper ends to the crown sheet of the fire box to provide a heat and smoke turning compartment in the upper front corner of the fire box to the rear of a predetermined number of upper boiler tubes and to provide a water passage between the plates and an inclined baflie plate in the front compartment fixed at its'upper end to the front boiler sheet and at its lower end to the wall of the boiler.

2. A baffle wall for locomotive fire boxes consisting of a pair of spaced angular plates fixed at their upper ends to the crown sheet of the fire box and at their lower ends to the rear boiler sheet to provide a water passage between the plates and a heat and smoke turning chamber to the rear of a predetermined number of upper tubes of the boiler, said baffle wall being arranged to occupy the upper front corner of the fire box.

In testimony whereof, I have hereunto signed my name to the specification.

HARRY S. JARNA GIN. 

